Scroll saw



June 30, 1925. 1,544,425

J. BLANK SCROLL 'SAW Filed Jan. 29', 1923 2 Sheets-Sheet 1 Inventor: I (7- June 30, 1925 J. ELANK SCROLL SA"?! Filed Jan. 29, f-g flsheetysheet 2 Fig. 6.

Inventor:

Patented June 30, 1925.

UNITED STATES 1 AT Eur 1 OFFICE JosErn BLANK, or NEWPORT, KENTUCKY; AssIeNoa'ro J. A; liAY' & EGAN- COM PANY, 0F CINCINNATI', OHIO, A CORPORATION OF WEST VIRGINIA SCROLL. saw.

.App1i cation filjedianuary 9,1 23. semi n e aseaj- To all whom Mandy concern: v Be it known that I, JOSEPH BLANK, a citlzen of the United States, residing at Newport, in the county of Campbell, and State of Kentucky, have invented certain new and useful Improvements in Scroll Saws, of

whichthe following is a specification.v

My invention relates toscroll saws, and has for its object the provision of novel and compact means for applying tension to the saw-blade. g M

It is the object of my invention, further, to provide novel means whereby tension is applied to the saw-blade by coiled f spring their en means located in substantiall V tirety close to the plane in whlch the sawblade operates; further, to providea stepa pulley comprising pulleys of different diameters respectively having connection by flexible means with the saw-blade and with coiled spring means located in; compact relation with said steppulley; further, to provide a bellows actuated by said spring means; further, to providecompact arrange- The invention will be further readily .un-

derstood from the following description and claims, and from the drawings, in which latter:

Fig. 1 represents a front elevation of a scroll saw embodying my invention.

Fig. 2 is a side elevationof the same. Fig. 3 is a vertical section of my improved device taken on the line 3-3 of Fig. 2.

Fig. 4 is a vertical section of my improved device taken on the line 4-4 of Fig. 1.

Fig. 5 is a vertical section of my improved device taken on the line 55 of Fig. 2.

Fig. 6 is a horizontal sectional View taken on the line 66 of Fig. 2; and,

Fig. 7 is a detail in vertical section taken on the line 77- of Fig. 3. v

I have exemplified my invention as applied to a scroll saw comprising a gooseneck frame to support the tensioning means, 7

although it is obvious that the tensioning means may be supported in different manner 55 b usual means now employed tor supportments of tensioning devices whereby the saw-blade. slot 45 in which the saw-bladeis' received,

above. j 1 e g I The scroll saw is exemplified as comprismg a pedestalv 11, in which ashaft 12' is journaled. Theshaft may be driven insuitable ;manner, and has on it a. crank-plate 13, on which there 13 a crank-pin 14. Apit- Iman 15 has a bearing 16 at its lower end ing tensioning; of thisicharacter ,from

aboutsaidcrank pin, and is at itsupper end articulated at17 with a slide 18, slidable up I and down in a guide 19 onthe pedestal.

The slide has on it a usual hook 21, fo-r having the lower end of a scroll saw bl'ade 22 attached'thereto. i

The goose-neck frame 25extends I from the'pedestal, and is provided with a support 26 A bar 27 slidable up and down in the support in a bearing 28, and is arrangedto be clamped in adjusted positions by,means of a bolt 29. Ausual saw-guide- 30 is at the lower-ends of the bar position to guide the rear. edge offthe sawblade.

A casing has a shaft 36 journaled therepulley thereon comprising a pairof pulleys 38, 39, of smaller diameter, and a pulley 40 of greater diameter shown. located between said pair of pulleys. These pulleys be by means of a nail42. The other end of this flexible, connection is provided with a in in bearings .37. This shaft has ,a stepusual'hook 43, arranged to be connected with the upper end of'the saw-blade. This connection is similar to the connection between and is instanced as comprising a pin 44' in.

the respective ends of the pin being located the slide and the lower end of the saw-blade,

in the hook at the respeCtive sides of said slot and of the saw-blade.

A pair of flexible connections, shown' as belts 47, 48, are'received about thejpair of pulleys of smalle-rdiameter, and are secured at one of their ends tofsaid pulleys, asjby means of nails 49,50, f I

Coiled spring means have attachment with the outer ends of said pair of belt-sfor eerting tension upon the sjamef, These coiled springs are located in compact relation with said step-pulley and are preferably located in their entirety close to the plane in which the, saw blade, ,reciprocates to reduce vibration of the parts. The spring .means are shown as comprising a pair of coiled springs 51, '52, shown as helical springs. v V

The means for attachment 'oflthe lower ends of the springs are shown as comprising bolts 53, 54, having conical heads 55 received in the lower. windings of the respective,

Springs. These' lower windings are shown contracting ,toward the lower ends of the springs, asshown at 56, which are thus of jvolute' form to hold said conicalfheads.

The bolts have nuts 57v threaded thereover i against the lower ends of the springs to -securely,hold the bolts bypressure of their "heads and said nutsfupon the lower-ends of said springs, The lower ends .ofthe bolts are provided with holes,- through which rings 58 are received. The outer endsof the belts 47, 48, are passed through said rings to jendsof said belts to said springs. p j

,Bolts 63, 64, have conical heads 65 received in the upper contractingly wound ends form loops 59, 60, for attaching the outer of springs, which are thus of volute form, as shown at 66: The bolts have nuts67 thread- "ied thereo-ve'r against the upper ends of the springs to securely hol'd the bolts by pressure form shownfcomprises heads 72, 73, con-' the air.

of their heads and said nuts upon the upper bolts extend) "through" holes' in the upper wall of the casing and have nuts68, 69,- threaded there "ends 'ofthe springs. The

over,"for axially adjusting said threaded shanks and thereby adjusting the tensions of said springs.

A bellows 71 is provided, and, in the bentllower ends through which said bolts, pass,nuts 77 clamping said bent ends'betweenthe nuts 57 and 77.

I A plate 81 hasholes through which the bolts 63, 64, pass,' the plate being secured between the nuts 67 and nuts 82 on said- ..respective' threaded shanks. It is secured to the head 72 of said, of suitable screws;

bellows, as by means A" hose 85 connects with said bellows and leads to a mouth 86 adjacent to the toothed edge of the. saw-blade, for projecting puffs of air upon the work in advance of the saw-blade in order that the work in advance of the saw-blade' may be free to the view ofthe operator. The pipe may contain 'aflexible portion 87'. suitable Abelt-guide 96 comprises a loop 97 the belt 41, "and is adjustably-secured to the v clamp 88 may beprovided at the lower end of the bar, or at any other suitable point, for adjust-ably positioning the mouth of the pipe with relation to the blade and work... The bellows is provided with ausual flap-valve 89 for admission of air to pre-. vent suction at the mouth of the pipe.

The tensioning parts mentioned may be located in the casing 35,, which may be of aluminum, and which is preferably adjustably positioned on the support toward and from the, pitman in order to provide the commodate the tensioning-meansto different lengths of saw-blades) 'The casing is ad-. 'justable upv and down on "a guide-way 91 proper tension upon the saw-blade and to ac v on the'support A bolt 92"passes through 7 over the threaded end of the bolt for clampingly holding the casing in adjusted positions on the support clamping .the

support and: casing between-{the head of the :olt'fand the clamping nuts 1 about lower-wall of the casing-by means of a bolt 98 received, through zaslot; 99 in the "-belt guide and into athreaded hole into 95 the lower wall of the casing.

lVIy improved device forms compact means .of lightweight and few parts for providing tensions upon the scroll sawblade, I provides novelnmeans comprising spring means'whose axes are'substantially parallel with the saw-bladev or located close a slot 93 in 'theusupport'zand a bearing 94 i in the'casing, a hand-nut95 being received tothe plane in which the saw-blade recipw l'rocatespfand" provides means in which undue vibrations due to overhanging parts and mechanisms are "avoided, and an arare located within narrow compassand the tensioning stresses' are confined to; paths closely adj acent to the reciprocating movements of thesa-w-blade.

tion, what I claim as "new, secure by Letters Patent, isz" rangement in which the tensioning-means it, Having thus fully described myjinyhQ and desire to. V

1;In a scroll saw,t he.combination of a; 7

step-pulley 1 comprising a'pulley' of greater diameterbetween thepair of pulleys of smaller diameter, a flexible connection about said pulley of greater diameter arranged for connection with the saw-blade,

pulleys of smaller diametena pair of coil springs having operative connections with for independently adj usting the 1 tensions of said springs.

2; In a scrollsaw, the c'onibinationof a step-pulley comprising a pulley offg a pairof flexible connections'about said" said pair of flexible connections, and means 7 diameter bet-weeniapair of pulleysofsmaller diameter, a fl'exible connection about said pulley of greater diameter arranged for connection with the saw-blade, a pair pedestal, a table thereon, means on said ped-' estal under said table for reciprocating the saw-blade, a goose-neck fixed to said pedestal and comprising a head above said table, a casing, a step-pulley comprising a pulley of greater diameter between a pair of pulleys of smaller diameter journaled in said casing, a flexible connection about said pulley of greater diameter arranged for operative connection with said saw-blade, a pair of flexible connections about said pulleys of smaller diameter, a pair of spaced-apart coil springs in said casing having operative connections with said pair of flexible connections, means on said casing for independently adjusting said springs, and means for adjustably fixing said casing up and down on said head.

4. In a scroll saw, the combination of a table, means under said table for reciproeating the saw-blade, a head above said table, a casing adjustable up and down on said head comprising tension means, means for securing said casing to said head in adjusted positions, a step-pulley comprising a pulley of greater diameter between a pair of pulleys of smaller diameter journaled in said casing, a pair of coil springs, a flexible connection about said pulley of greater diameter having operative connection with said saw-blade, a pair of flexible connections about said pair of pulleys of smaller diameter, a fork extending from, the lower ends of said springs and receiving said tension means between the tines of said fork, means on said casing for adjusting the upper ends of said springs, a bracket extending from the upper ends of said springs, and a bellows comprising heads respectively secured to said fork and to said bracket.

5. In a scroll saw, the combination of a table, means under said table for reciprocating the saw-blade, a head above said table, a casing adjustable up and down on said head comprising tension means, means for securing said casing to said head in adjusted positions, astep-pulley comprising a pulley of greater diameter between a pair of pulleys of smaller diameter journaled in said casing a pair of coil springs, a flexible connection about said pulley of greater diameter having operative connection with said saw-blade, a pair of flexible connections about said pair of pulleys of smaller diameter, a fork extending from the lower ends of said springs and receiving said tension means between the tines of said fork, means on said casing for adjusting the upper ends of said springs, a bracket extending from the upper ends of said springs, a bellows comprising heads respectively secured to said fork and to said bracket, a pipe extending from said bellows, said pipe including a flexible section and a mouth adjacent to said saw-blade, and means for adjustably secur' ing said mouth to said head with relation to said table and said saw-blade. I Y

6. In a scroll saw, the combination of a table, a head thereabove, a casing, means for adjusting said casing on said head compris ing a bolt, a step-pulley comprising a pulleyof greater diameter between a pair of pulleys of smaller diameter and ournaled in said casing, a flexible connection about said pulley of greater diameter arranged for connection with the saw-blade, a pair of flexible connections about said pair of pulleys of smaller diameter, a pair of spaced-apart coiled springs, a fork, the tines of said fork and the upper ends of said pair of flexible connections secured to the lower end of said spring, said bolt located in the space between said, tines, a bracket secured to the upper ends of said springs, and a bellows comprising heads respectively secured to said fork and to said bracket, said pair of flexible connections, springs, fork and bracket inclosed in said casing.

7. In a scroll saw, the combination of a 7 table, a head thereabove, a casing, vmeans for adjusting said casing on said head comprising a bolt in said casing, a step-pulley comprising a pulley of greater diameter between a pair of pulleys of smaller diameter and journaled in said casing, a flexible connection about said pulley of greater diameter arranged for connection with the saw-blade,- a pair of flexible connections about said pair of pulleys of smaller diameter, a pair of spaced-apart coiled springs, a fork, the tines of said fork and the upper ends of said pair of connections secured to the lower ends of said springs, said bolt located 'in the space between said tines, means on said casing for adjusting the upper ends of said springs up and down, a bracket and said last-named means secured to the upper ends of said springs, and a bellows comprising heads respectively secured to said'fork and to said bracket, said pair of flexible connections, springs, fork and bracket inclosed in said casing. p

In testimony whereof, I have hereunto signed my name in the presence'oftwo subscribing witnesses.

JOSEPH BLANK.

Witnesses CATHERINE GROLLEW:

J. G. GRIMES. 

